Ok, i went to work last night(which was a pain in the A$$!!! because kids through mud all over the walls) and i was driving to take garbage up to dump(about 1/4 mile driveway, cealcoated road with pee gravel on it). Keep in mind i dont' drive over 20 on this road because i don't want to through rocks on my already beaten paint. Ok while i was driving i heard a grinding noise like a muffeler droped. So i was like ok i knew my resinator was rusted but not bad enough to drop. I got out looked all under my car(the engine is off at this point because idk wut is was). I see nothing. So i say wut the hell, i look on the ground for a piece of metel i've run over and nothing. So i check the CVC joints(i think that's wut their called) to see if somethings effed up with those, nothing. I get back in, stat, put in drive, and the noise again. So i leave the engine on, pop the hood look to see if anyting's rubing or messing withthe belts, look under the car, i can't find anyting. I got back in drive slowly and i can't get it to make the noise. I drove home with no problems. Oh i forgot to mention that when the noise was made the car had already been on for 10 minutes. And when i first got in it, i reversed, drive, went got trash, then took off and when i did, it went in drive i gave it gas, and thin a little lerch forward like it had just gone in drive. IDK wut that means but i tought i'd mention it. Please help if you can. I put this here because idk wut the problem is caused by and it really pissed me off so i'm blowing off steam.